package socket;
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.net.ServerSocket;
import java.net.Socket;
import java.nio.charset.StandardCharsets;

/**
 聊天室的服务器2
 利用多线程完成与客户端交互，主线程只负责接收连接
 实现多个客户端同时连接服务器
 */
public class Server2 {
    private ServerSocket serverSocket;
    public Server2(){
        try {
            System.out.println("正在启动服务器");
            serverSocket=new ServerSocket(8888);
            System.out.println("服务端启动完毕");
        } catch (IOException e) {
            e.printStackTrace();
        }
    }
    public  void start(){
        try {
            while (true){
                System.out.println("等待客户端连接...");
                Socket socket=serverSocket.accept();
                System.out.println("一个客户端连接上了!");
                //启动一个线程负责与该客户端交互
                Runnable handler=new ClientHandler(socket);
                Thread t=new Thread(handler);
                t.start();
            }
        } catch (IOException e) {
            e.printStackTrace();
        }
    }

    public static void main(String[] args){
        Server2 server=new Server2();
        server.start();
    }

    //该线程负责与指定的客户端交互
    private class ClientHandler implements Runnable{
        private Socket socket;
        private String host;//记录该客户端的IP地址

        public ClientHandler(Socket socket){
            this.socket=socket;
            //通过socket获取远端计算机的IP地址的字符串格式
            host=socket.getInetAddress().getHostAddress();
        }

        public void run(){
            try {
                InputStream in=socket.getInputStream();
                InputStreamReader isr=new InputStreamReader(in, StandardCharsets.UTF_8);
                BufferedReader br=new BufferedReader(isr);
                String massage;
                while ((massage=br.readLine())!=null){
                    System.out.println(host+":"+massage);
                }
            } catch (IOException e) {
                e.printStackTrace();
            }
        }
    }

}
